Hmmm...ok so since I've made this post I've been doing it the dirty way. I made an Autohotkey script to copy each frame from 1 to 120 and paste them past 121-240 and so on.
That's fine and all, but I've run into a different problem now. I've done basically 10 seconds (up to frame 1000ish) of copying keyframes from 1-120, but now the game just freezes when I try to load the stage. I'm pretty sure that there's a limit to how many keyframes you can have in a chr0 file. Can someone confirm this for me? If so this is gonna suck =\
do u just want the animation longer? if so u can use a frame rate modifyier via psa